1. Do the load voltages for the original and Thévenized circuits match for both loads? Is it logical that this could be extended to any arbitrary load resistance value?
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- Consider the one-line diagram of power system shown below; a) Develop equivalent circuit expressing all parameters in per unit values select Sbase= 100MVA b) Apply circuit reduction techniques and then find the net impedance(Zeq) at point of fault F2 c) Calculate fault level and fault currentA circuit feeding a single-phase load of 2.75 kW at 0.85 power factor and 240 V at an ambient temperature of 55°C by means of a 27 m single-core PVC insulated cable run in conduit along with another circuit. 1) Determine the installation method 2) Compute the circuit design current (/g) 3) Determine the nominal current (Za) of the circuit breaker 4) Find the temperature correction factor (C;) and adjust current for temperature 5) Find the grouping correction factor (Cy) and adjust current for grouping of cables 6) Select cable size and determine its current carrying capacity (/z) 7) Check voltage drop (V.D.) and correct cable size if V.D. > 6 VConsider a simple power system: two generators (20MVA each at 13.2kV) running in parallel via a combined generator step-up transformer (rated at 30/33.3/36.7 MVA: ONAN/ONAF/ONAF cooling, 13.2 (Delta)/115 (Solidly Grounded Wye) kV). The sub-transmission line is 10.0mi long and rated at 115kV. Estimate (write the assumptions) the 3-phase bolted fault current at the end of the 115kV line.
- The figure below shows a radial transmission system with a generator having a terminalvoltage of 95 KV at angle of10.5°. The load demand is 50 MW at a power factor of 0.88 lagging.Use a base of 128.4MVA . Instructions :round of to 2 decimal places. Calculate the following : 1.Load current (A) and Base current (A) 2Per unit impedance of transformer 2 and Per unit impedance of transformer 1.3.Per unit voltage of the generator. And Per unit voltage of the line. 4.Per unit voltage of the transformer 1 5.Per unit impedance of the line.6.Resistance of the transmission line when the load consumes full-load (Ω).I) Determining the voltage amplitude and angle values of each busbar II) To determine the active and reactive power values flowing from each transmission line III) To determine the active and reactive power loss values in each transmission line IV). Determining the total active and reactive power loss values in transmission lines in the power system V) To determine the power system temporary stability limit values To explain the reasons for load flow in power systems given above, which option is the correct one of the 5 explanations given? A) II,III,IV B) I,II C) I,II,III D) I,IV E) I,II,IVBus bar system which ensures continuity of supply during maintanence is ............ O duplicate bus bar O single bus bar without sectionalization O single bus bar O single bus bar with sectionalization
- A 330 kV power system contains three substations A, B and C having fault levels of 20 GVA each. The system is to be reinforced by inserting three current limiting reactors of j5 Ω each in between the busbars interconnecting the generators. Resistance is to be neglected. a) Draw a circuit diagram to indicate the inserted current limiting reactors. Use the diagram to answer the following questions: i) Calculate the respective reactances of the three generators b) Assuming a symmetrical fault occurs at C, calculate the following: i) Total reactance ii) New fault current iii)New fault MVAQ4 / Equipment ratings for the four - bus power system shown in Figure are given as follows: TI 73 60 500 Generator GI: 500 MVA, 13.8 KV. X = X2 = 0.20. Xo = 0.10 per unit Generator G2: 750 MVA, 18 KV.X = X2 = 0.18, Xo = 0,09 per unit Generator G3: 1000 MVA, 20 kV, X = 0.17. Xz = 0.20.Xo = 0.09 per unit Transformer Ti: 500 MVA, 13.8 kV A / S00 kV Y. X = 0.12 per unit Transformer T2: 750 MVA, 18 LV A / 500 kV Y, X = 0.10 per unit Transformer T3: 1000 MVA, 20 kV A / 500 kV Y. X = 0.10 per unit each line: X = 50 ohms, X, = 150 ohms 77 The inductor connected to generator G3 neutral has a reactance of 0.028 pu. Draw the zero-, positive-, and negative - sequence reactance diagrams using a 1000 - MVA, 20 - KV base in the zone of generator G3Fill in the blanks 1. Grounding is connecting …….. of electrical equipment to earth. 2. When a …………………………….… fault occurs on an ungrounded neutral system, the potential of the healthy phases rise to the line voltage. 3. The method of reactance grounding is not used because of ……………………… appearing under fault conditions. 4. The cosine of the angle between the ………………………………………. and the ………………………………...…… is called the sending end power factor. 5. The AC power delivered to a load is equal to ………........
- PowerWorid Simulator case Problem 3_60 duplicates Example 3.13 except that a resistance term of 0.06 per unit has been added to the transformer and 0.05 per unit to the transmission line. Since the system is no longer lossless, a field showing the real power losses has also been added to the oneline. With the LTC tap fixed at 1.05, plot the real power losses as the phase shift angle is varied from 10 to +10 degrees. What value of phase shift minimizes the system losses?Determine the bus admittance matrix (Ybus) for the three-phase power system shown in Figure 6.23 with input data given in Table 6.11 and partial results in Table 6.12. Assume a three-phase 100 MVA per unit base. TABLE 6.11 Bus input data for Problem 6.20 TABLE 6.12 Partially Completed Bus Admittance Matrix (Ybus) for Problem 6.30Substations have the functions of: Transmission Elevator, Subtransmission Lower and Distribution, according to their purpose. The common characteristic of the types presented is their objective, which is to modify the characteristics of electrical energy. Substations have sets of conductors, equipment and devices, and with these sets they work to ensure performance and safety in the electrical distribution system. Substations are also responsible for switching, protection, voltage and current transformation, reactive compensation to direct the power flow and enable its diversification through alternative routes, or a combination of these in the Electric Power System (SEP) . Describe the role of substations in the distribution of electricity, and what is their relationship with the primary and secondary distribution, describing the consumers of these demanded loads. PLEASE TYPEABLE BECAUSE THE LETTERS GET IN THE UNDERSTANDING.